JP2005195005A - Method for assembling scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for assembling a scroll compressor, for assembling to a sealed container a compression unit in which a compression part and a main frame are previously assembled. <P>SOLUTION: The previously assembled compression unit 100 is horizontally set on a compression unit fixing base 300 so that a shaft 6 is perpendicularly located, and positioned on the compression unit fixing base 300 so that the axis of the shaft 6 is located on the center line of the compressor. After that, the compression unit 100 is pressure-fitted into an opening on one end side of a container body 21, and the container body 21 is integrally welded to the compression unit 100 by a welding means 600. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  More particularly, the present invention relates to a method of assembling a scroll compressor, and more specifically, corrects manufacturing distortion of a container body when mounting a main frame supporting a refrigerant compression section in the container body of a sealed container. The present invention relates to a method for assembling a scroll compressor in which a compression portion is mounted in a container body while performing centering.

  The scroll compressor engages two spiral scroll wraps composed of a fixed scroll and a revolving scroll to form a crescent-shaped compression space between the wraps, and revolves the revolving scroll with respect to the fixed scroll. The compressor is known as a compressor using the principle of compressing the refrigerant by gradually reducing the volume of the compression space from the outside of the wrap toward the center.

  An example of the internal structure of the scroll compressor is shown in FIG. 9 and will be described. In this scroll compressor 1, a main frame 3 is disposed inside a cylindrical sealed container 2 that is installed vertically, and a compression unit 4 having a fixed scroll 41 and a turning scroll 42 is provided above the main frame 3. In addition, an electric motor 5 that drives the compression unit 4 via a shaft 6 is provided below the main frame 3.

  The main frame 3 is provided with a main bearing 31 that supports one end of the main shaft 61 of the shaft 6, and a sub-bearing 71 that supports the other end of the main shaft 61 of the shaft 6 is further provided in the sealed container 2. A sub-frame 7 is provided.

  An electric motor 5 is provided between the main frame 3 and the sub frame 7, and the electric motor 5 is coaxially disposed inside the stator 51 and a stator 51 fixed to the inner peripheral surface of the container body 21. And the rotor 52 is integrally attached to the shaft 6.

  The main frame 3 and the sub frame 7 are fixed to the container body 21 by welding. When the two are welded, the main bearing 31 and the sub bearing 71 are fixed in a state where they are aligned with each other so that their axes coincide with each other. There is a need.

  In other words, if the axial misalignment between the main bearing 31 and the sub-bearing 71 is large, the load on the electric motor 5 increases due to the contact between the bearings 31 and 71. Further, the balance of the magnetic gap between the stator 51 and the rotor 52 may be lost, and the startability of the compressor may be deteriorated.

  Therefore, Patent Document 1 discloses an example of a method for accurately welding and fixing the main frame 3 and the subframe 7 to the container body 21 by aligning the axial centers thereof. According to the assembling method of Patent Document 1, first, as shown in FIG. 10A, the main frame 3 is placed on the horizontal reference plane 81 of the fixed base 8 and centered by the chuck claws 82 as a first step. Then, the container body 21 to which the stator 51 is previously attached is lowered toward the main frame 3 by the lifting means, and the main bearing 31 and the stator 51 are fixed by the fixing means (both not shown). The lower end side of the body 21 is welded to the main frame 3.

  Next, as shown in FIG. 10B, as a second step, the shaft 6 with the rotor 52 integrally attached is attached to the main bearing 31 of the main frame 3 through the inside of the container body 21. Then, as shown in FIG. 10C, as the third step, the subframe 7 held by the centering device 9 is inserted from the upper end of the container body 21, the subframe 7 is centered, and the upper end of the container body 21 is The side is welded to the subframe 7. Thereafter, the compression unit 4 is attached to the main frame 3 in a separate process.

Japanese Patent No. 3250348

  Usually, the container body 21 used in the compressor is formed by processing a thick steel plate into a cylindrical shape, and thus has distortion during processing, and in most cases is not exactly a perfect circle. Even a seamless cylindrical body is not guaranteed to be a perfect circle. Moreover, the container body 21 may be further distorted due to a difference in solidification time due to welding. Further, the container body 21 may be further distorted by welding the main frame 3 and the subframe 7.

  Further, when the compression unit 4 is attached to the main frame 3, it is necessary to perform relative alignment (alignment) of the fixed scroll 41 and the orbiting scroll 42 including the main frame 3, but when the alignment work is performed. In Patent Document 1, since the container body 21 is first attached to the main frame 3, the main frame 3 cannot be directly gripped, and the alignment work is performed with reference to the outer periphery of the container body 21. Not very preferable.

  As another problem, the shaft 6 shown in Patent Document 1 has the crankshaft 62 formed at the tip thereof within the rotation radius of the main shaft 61, so that the main frame 3 is placed on the fixed base 8. Even after mounting, the shaft 6 can be inserted into the main bearing 31 of the main frame 3. However, this shaft needs to increase the diameter of the main shaft 61 in order to obtain compressibility. If the diameter is increased, not only the sliding loss of the main bearing 31 increases, but also the volume of the rotor 52 decreases, and the electric motor 5 The power of is also reduced.

  Therefore, it is preferable in terms of performance to use a shaft formed so that the crankshaft 62 projects outward from the rotation radius of the main shaft 61. However, when this shaft is used, prior to assembling the compression portion 4 to the main frame 3. Since the shaft of the other form needs to be inserted into the main bearing 31 of the main frame 3 in advance, the assembly method of Patent Document 1 cannot be applied.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to manufacture the main body that supports the refrigerant compression section in the container body of the closed container. An object of the present invention is to correct the distortion and enable the compression part to be mounted in the container body while performing accurate centering. Another object of the present invention is to enable a compression unit in which a compression unit and a main frame are assembled in advance to be assembled in a sealed container.

  In order to achieve the above-described object, the present invention provides a compression unit having a fixed scroll and an orbiting scroll, an electric motor for driving the orbiting scroll through a shaft, and one end of the main shaft of the shaft. In a method for assembling a scroll compressor, comprising: a main frame having a main bearing that supports the compression portion; and a subframe having a sub-bearing that supports the other end of the main shaft of the shaft. A pre-assembly process including a compression unit assembly process in which the compression unit and the shaft are assembled to form a compression unit, and a rotor mounting process in which the rotor of the electric motor is integrally attached to the main shaft of the shaft, The compression unit is set on the compression unit fixing base in a horizontal state so that the shaft is vertical. A leveling step, a compression unit centering step for positioning and fixing the compression unit so that the axis of the shaft is positioned on the center line of the compressor on the compression unit fixing base by the compression unit fixing means, and a container After the container body is supported by the holding means so as to be coaxial with the axis of the shaft, the compression unit fixing base and the container holding means are connected by the first press-fitting means so that the opening on one end side of the container body is compressed. A compression unit press-fitting step of press-fitting the compression unit into an opening on one end side of the container body by relatively moving until it comes into contact with the unit fixing base, and the container body is fixed to the compression unit by the first press-fitting means. A compression unit welding step in which the container body is integrally welded to the compression unit by welding means while being pressed against the table. It is characterized by carrying out the free rear assembly process.

  In the compression unit leveling step, it is preferable that a horizontal reference surface is formed on the back side of the fixed scroll in order to perform leveling more accurately.

  The present invention also includes a subframe attachment step. That is, the post-assembly step further includes a sub-frame leveling step in which the sub-frame is set in a horizontal state on the sub-frame fixing base, and an axis of the sub-frame on the sub-frame fixing base by the sub-frame fixing means. The subframe centering step for positioning and fixing the subframe so as to be positioned on the center line of the compressor, and the second press-fitting means connect the subframe fixing base and the container holding means to the other end side of the container body. The sub-frame press-fitting step of press-fitting the sub-frame into the opening on the other end side of the container body, and the second press-fitting means In a state where the container body is pressed against the subframe fixing base, the container body is integrally fused to the subframe by welding means. It includes a sub-frame welding step of the.

  Also in the subframe leveling step, it is preferable that a horizontal reference plane is formed on the back side of the subframe in order to perform leveling more accurately. Moreover, the aspect which equips the said sub-frame fixed base with the electromagnet is also contained in this invention.

  According to a preferred aspect of the present invention, in order to accurately center the compression unit, the compression unit fixing means are arranged at equal intervals on a circumference centered on the center line of the compressor, and , And a plurality of chuck claws that are movable along the radial direction of the circle and engage with the chuck grooves formed on the fixed scroll side.

  Each chuck claw can be moved up and down in the vertical direction, and it is preferable to press the compression unit to the compression unit fixing base side through the chuck groove during the lowering operation. The groove has a tapered surface that converts a horizontal force into a downward force at a portion engaging with the chuck claw, and the chuck claw compresses the compression unit via the tapered surface when moving inward in the radial direction. You may make it press on the unit fixing stand side.

  In the present invention, a recess is formed on the outer peripheral surface of the main frame and / or the sub frame to form a gap having a predetermined width with the inner surface of the container body, and the recess is selected as a welding location by the welding means. Is preferred. According to this, welding distortion caused by welding can be released by the recess.

  The concave portion may be formed as a series of annular grooves along the circumferential direction of the outer peripheral surface. Alternatively, the concave portion may be partially formed along the circumferential direction of the outer peripheral surface. .

  According to the present invention, the shaft has a main shaft as an output shaft of the electric motor, and a crank shaft that is formed eccentrically with respect to the main shaft and connected to the orbiting scroll, and the crank shaft is connected to the main shaft. When formed so as to protrude outward from the outer diameter, in the compression unit assembly step, after inserting the main shaft of the shaft into the main bearing of the main frame and connecting the crank shaft to the orbiting scroll, The fixed scroll is attached to the main frame.

  According to the present invention, since the container body is press-fitted into the main frame, the container body is tightly fitted to fit the outer peripheral surface of the main frame even if the container body has manufacturing distortion. be able to. The same applies to the subframe side, so that the compression part can be mounted in the container body while performing accurate centering.

  In addition, since a compression unit in which a compression unit, a main frame, and a shaft of an electric motor are assembled in advance can be incorporated in a sealed container, a scroll compressor having a shaft with a crankshaft projecting outside the outer diameter of the main shaft Can be applied.

  Next, embodiments of the present invention will be described with reference to the drawings. First, the internal structure of the scroll compressor assembled according to the present invention is shown in the sectional view of FIG. 1 and will be described. However, the present invention is not limited to this. Note that the same reference numerals are used for portions that are the same as or the same as those in the above-described conventional example.

  As shown in FIG. 1, this scroll compressor 10 has a cylindrical hermetic container 2 placed vertically, in which a main frame 3, a refrigerant compression section 4, an electric motor 5, and a shaft (rotation drive shaft) 6 are provided. And the sub-frame 7 is accommodated. In addition, the sealed container 2 contains a power cable for driving the electric motor 5, a lubricating oil for lubrication, and the like, but these are not important components for the present invention and are not particularly illustrated. And the description thereof is also omitted.

  The sealed container 2 includes a cylindrical container body 21, and an upper lid 22 and a lower lid 23 that are integrally attached to both end sides of the container body 21. The container body 21 may be either a cylindrical body formed by processing a thick steel plate into a cylindrical shape and welding both ends, or a seamless cylindrical body. The upper lid 22 and the lower lid 23 are welded to the container body 21 in the final step.

  The main frame 3 has a disk-like frame whose outer periphery is formed in a substantially circular shape, and a main bearing 31 that supports the main shaft 61 of the shaft 6 is formed at the center thereof. On the upper surface side of the main frame 3, there is formed a storage recess 32 in which the end plate 421 of the orbiting scroll 42 is stored via an Oldham ring 33 for preventing rotation. Since the main frame 3 is press-fitted into the container body 21, its outer diameter is formed slightly larger than the inner diameter of the container body 21.

  The center of the storage recess 32 is formed to be one step lower, and the crankshaft 62 of the shaft 6 and the boss 423 of the orbiting scroll 42 are stored in a state in which the orbiting movement is possible. Further, the main frame 3 is provided with an oil drain passage (not shown) for returning the lubricating oil supplied to the upper portion of the main frame 3 to the bottom side of the hermetic container 2 by the oil guide hole 63 formed in the shaft 6. It has been. In the case of the internal high-pressure type, the main frame 3 is provided with a refrigerant passage (not shown) for guiding the high-pressure refrigerant generated in the sealed working chamber 44 of the compression unit 4 to the electric motor chamber.

  The main frame 3 is formed by cutting, for example, and its outer peripheral surface is smooth. However, as shown in FIGS. 2 (a) and 2 (b), the main frame 3 is located between the outer peripheral surface of the main frame 3 and the inner surface of the container body 21. It is preferable to provide a concave portion 34 in which a gap having a predetermined width is formed, and select the concave portion 34 as a welding portion.

  The recess 34 may be a series of annular grooves along the circumferential direction of the outer peripheral surface of the main frame 3 as shown in FIG. 2 (a), or the main frame 3 as shown in FIG. 2 (b). It may be a groove partially formed along the circumferential direction of the outer peripheral surface. In any case, by using the recessed portion 34 as a welding point, distortion caused by welding can be released by the recessed portion 34. Note that if the width (depth) of the concave portion 34 is too large, it causes a defect such as spatter mixing, so the width of the concave portion 34 is preferably about 0.1 to 0.3 mm.

  The compression unit 4 is composed of a combination of a fixed scroll 41 and a turning scroll 42. The fixed scroll 41 has a spiral scroll wrap 412 integrally formed on the lower surface of a disk-shaped end plate 411, and a discharge port 413 for discharging a high-pressure refrigerant generated inside is formed at substantially the center. Is provided.

  The orbiting scroll 42 has a spiral scroll wrap 422 formed integrally on the upper surface of a disk-shaped end plate 421, and a cylindrical boss into which the crankshaft 62 of the shaft 6 is inserted at the center of the rear surface of the end plate 421. 423 is formed. When the scroll wraps 412 and 422 of the fixed scroll 41 and the orbiting scroll 42 are engaged with each other, a sealed working chamber 44 for compressing the refrigerant is formed inside.

  A horizontal reference surface 43 used in the leveling process of the compression unit is formed on the back side of the fixed scroll 41 (on the anti-revolving scroll 42 side, the top surface in FIG. 1). The horizontal reference surface 43 is preferably provided in the center portion of the fixed scroll, but may be provided in an annular shape on the outer peripheral side.

  The main frame 3 and the fixed scroll 41 are respectively provided with screw holes 34 and 44 for fixing the compression portion 4 to the main frame 3. After the alignment operation of the scroll wraps 412 and 422, the screw holes 34 and 44 are provided. 44 are fixed by screws 8.

  As the electric motor 5, an inner rotor type electric motor including a stator 51 attached along the inner peripheral surface of the container body 21 and a rotor 52 arranged coaxially at the center of the stator 51 is used. The shaft 6 is integrally attached to the center by shrink fitting, for example.

  The shaft 6 includes a main shaft 61 to which the rotor 52 is attached, and a crank shaft 62 that is integrally formed in an eccentric state on the upper end side of the main shaft 61. In this example, the crankshaft 62 is formed to protrude outward from the outer diameter (rotating radius) of the main shaft 61.

  Therefore, the crankshaft 62 cannot be inserted from the lower side in FIG. 1 of the main frame 3. In this example, the shaft 6 is connected to the main frame 3 before the compression portion 4 is assembled to form a compression unit. It is necessary to pass through the main bearing 31 of the frame 3.

  The sub-frame 7 has a disk-shaped frame whose outer periphery is fixed along the inner peripheral surface of the container body 21, and a sub-bearing 71 that pivotally supports the other end of the main shaft 61 of the shaft 6 is formed at the center. Has been. A horizontal reference surface 72 used in the leveling process of the subframe 7 is formed on the lower surface of the subframe 7 (on the side opposite to the motor 5 and the lower surface in FIG. 1).

  For assembling the scroll compressor 10 having the above configuration, an assembling apparatus described as an example is used. 3A and 3B are a front view and a side view of the assembling apparatus, and an XX line shown as a one-dot chain line in the drawing is a rotation center of the scroll compressor 10 to be assembled. Hereinafter, this XX line is referred to as a compressor center line.

  This assembling apparatus 200 has a sturdy frame structure made of a metal material, and includes a base 210 installed horizontally with respect to a foundation such as a floor, and a support frame 220 erected substantially vertically from the base 210. Yes. The base 210 is provided with a work table 230 for assembling the scroll compressor 10.

  The work table 230 is provided with a compression unit fixing base 300 on which the compression unit 100 (a compression unit in which the main frame 3, the compression unit 4 and the shaft 6 are assembled in advance) is placed. As shown in FIG. 4, the compression unit fixed base 300 includes a fixed base 310 formed in a disk shape, for example, that is horizontally installed on a work table 230, and the compression unit 100 is fixedly scrolled at the center of the fixed base 310. A mounting table 320 is provided with the 41 side facing downward.

  The mounting table 320 is formed so as to be one step higher in the central portion of the fixed base 310, and a horizontal reference surface 321 for leveling the compression unit 100 is provided on the upper surface thereof. A horizontal reference plane 43 of the fixed scroll 41 is set on the horizontal reference plane 321. The horizontal surface of the compression unit 100 is guaranteed by the two surfaces of the horizontal reference surface 321 and the horizontal reference surface 43.

  The compression unit fixing base 300 is provided with a compression unit fixing means 330 for fixing the compression unit 100 placed on the mounting base 320. As shown in FIG. 4, the compression unit fixing means 300 includes a chuck claw 331 that holds the outer peripheral surface of the fixed scroll 41 of the compression unit 100.

  In this example, the chuck claws 331 are arranged at four positions at 90 ° intervals on the circumference centered on the compressor center line XX, and each of them can be moved along the radial direction by a driving means (not shown). It is. Note that the number of chuck claws 331 may be arbitrarily determined as long as it is two or more.

  The plurality of chuck claws 331 are centered on the mounting table 320 so that the axis of the compression unit 100 (the rotation axis of the shaft main shaft 61) coincides with the compressor center line XX. As shown in (a), each chuck claw 331 can be moved up and down in the vertical direction by a driving means (not shown), and a locking bar 332 is provided at the tip of each chuck claw 331. It is preferable that a chuck groove 414 to be locked by the locking bar 332 is formed, and after the centering, the compression unit 100 is pressed and fixed to the mounting table 320 side.

  Separately from this, as shown in FIG. 5B, a taper surface (from the lower end) that converts a horizontal force into a downward force is applied to a portion of the outer periphery of the fixed scroll 41 that engages with the locking hook 332 of the chuck claw 331. A chuck groove 415 having a conical surface inclined in the direction of the compressor center line XX as it goes to the upper end is formed. When the chuck pawl 331 moves inward in the radial direction, the compression unit 100 passes through the tapered surface. May be fixed to the mounting table by pressing it toward the 320 side.

  As shown in FIG. 4, the compression unit fixing base 300 is provided with a receiving base 340 that receives the lower end 211 of the container body 21. The receiving table 340 is formed in an annular shape along the outer periphery of the mounting table 320, and the receiving surface 341 is formed horizontally.

  Referring to FIGS. 3A and 3B again, the support frame 220 has container holding means 400 for holding the container body 21 in a releasable manner, and press-fitting the compression unit 100 and the subframe 7 into the container body 21. Means 500 are provided.

  The container holding means 400 is supported by a pair of left and right guide rails 401 and 401 provided on the support frame 220 in a vertical direction so as to be movable up and down. The container holding means 400 includes a pair of left and right container holding arms 420 and 420 that rotate about one end side as a fulcrum. The container holding means 400 may be driven by elevating driving means such as a feed screw shaft, and the container holding arm 420 may be driven by rotary driving means such as an air cylinder, but these driving means are not shown for the sake of drawing. Has been.

  The container holding arms 420, 420 are formed symmetrically as, for example, arcuate arms, and hold the container body 21 from both sides so that the axis of the container body 21 is coaxial with the compressor center line XX. The container body 21 is positioned on the surface. In addition, when the container body 21 is held by the container holding arm 420, a guide unit that contacts the lower end surface 211 or the upper end 212 of the container body 21 and determines the height position of the container body 21 may be provided.

  As shown in FIG. 3B, the press-fitting means 500 includes an elevating base 510 that is movably supported by a pair of left and right guide rails 402, 402 that are provided in the support frame 220 in a direction perpendicular to each other. Although illustration of the raising / lowering drive means of the raising / lowering base 510 is abbreviate | omitted, for example, raising / lowering drive means, such as a feed screw shaft and an air cylinder, may be used.

  The lifting base 510 supports a press-fitting head 520 as a jig for pressing the container body 21 from above. As shown in FIG. 4, the press-fitting head 520 is formed of a disc body that is horizontally attached to the elevating base 510, and a horizontal pressing surface 540 that acts on the upper end 212 of the container body 21 is formed on the peripheral edge thereof. Yes.

  In this example, the press-fitting head 520 also serves as a sub-frame fixing base, and a sub-frame fixing base 530 that supports the sub-frame 7 is provided at the center of the press-fitting head 520. The sub-frame fixing base 530 is one step higher than the peripheral pressing surface 540 so as to enter the container body 21, and the support surface of the sub-frame 7 is horizontally aligned with the sub-frame 7 in a sub-frame press-fitting process described later. It is formed flat as a horizontal reference surface 531 for supporting the state.

  A concave portion 550 for allowing the sub bearing 71 of the sub frame 7 to escape is formed in the central portion of the sub frame fixing base 530, and a sub frame fixing means 560 is disposed in the concave portion 550. The sub-frame fixing means 560 includes a plurality of chuck claws 561 similar to the chuck claws 331 described in the compression unit fixing means 330. That is, the chuck claws 561 are preferably arranged at equal intervals on the circumference centered on the compressor center line XX, and can reciprocate along the radius line of the circle. is there.

  The subframe fixing base 530 is made of a magnetic material and is not shown, but the subframe fixing base 530 is provided with a coil for an electromagnet. That is, by energizing the coil, the sub-frame fixing base 530 becomes an electromagnet, and the sub-frame 7 is magnetically attracted and held.

  As shown in FIGS. 3A and 3B, the assembling apparatus 200 is provided with welding means 600 for welding the container body 21 to the compression unit 100 and the subframe 7. In this example, the welding means 600 includes welding torches 610 that are arranged at four positions, for example, at 90 ° intervals on the circumference centered on the compressor center line XX, and that are movable in the radial direction of the circle. I have. The number of welding torches 610 may be arbitrarily determined.

  In this example, each welding torch 610 can move up and down along the support frame 220 and is moved to a welding position with respect to the compression unit 100 and a welding position with respect to the subframe 7, but the welding torch 610 is disposed at each welding position. It may be.

  The support frame 220 is further provided with a control console 210 for controlling the compression unit fixing means 330, the container holding means 400, the press-fitting means 500, and the welding means 600. In the control console 210, a display monitor, various operation panels, and the like are integrally incorporated, and for example, a press pressure can be set by inputting various set values.

  In this example, the compression unit fixing base 300 is fixed, and the container holding means 400 and the press-fitting means 500 are provided so as to move respectively. However, in the present invention, the compression unit fixing base 300, the container The holding unit 400 and the press-fitting unit 500 are only required to be relatively movable, and the compression unit fixing base 300 side may be movable.

  Next, an example of an assembly procedure of the scroll compressor 10 using the assembly apparatus 200 will be described with reference to FIGS.

  First, the pre-assembly process performed as preparation before assembling the scroll compressor 10 by the said assembly apparatus 200 is demonstrated. In this pre-assembly process, a compression unit assembly process in which the compression unit 4 and the shaft 6 are incorporated into the main frame 3 to form the compression unit 100, and a rotor attachment in which the rotor 52 of the electric motor 5 is integrally attached to the main shaft 61 of the shaft 6 The process and the stator attachment process which attaches the stator 51 of the electric motor 5 integrally in the container body 21 of the airtight container 2 are included.

  In the compression unit assembly process, the main shaft 61 of the shaft 6 is inserted into the main bearing 31 of the main frame 3, the crank shaft 62 is connected to the boss 423 of the orbiting scroll 42, and then the fixed scroll 41 is attached to the main frame 3.

  According to this example, since the shaft 6 is formed so that the crankshaft 62 projects outward from the outer diameter of the main shaft 61, it is necessary to attach the shaft 6 to the main frame 3 first. In the case where the crankshaft 62 is provided in the diameter, the shaft 6 may be inserted into the main bearing 31 of the main frame 3 after the compression portion 4 is incorporated into the main frame 3.

  After completing the compression unit assembly process, the relative lap position between the fixed scroll 41 and the orbiting scroll 42 is positioned (alignment) in a compression unit alignment process having an alignment device (not shown). The rotor mounting step is performed using a dedicated rotor mounting device. In this example, the rotor 51 is integrally mounted on the main shaft 61 of the compression unit 100 by shrink fitting. The stator attachment process is also performed using a dedicated stator attachment device. In this example, the stator 52 is also integrally attached to the inner surface of the container body 21 by shrink fitting. Note that the stator attachment process may be performed not in the pre-assembly process but in the post-assembly process described below.

  Next, the compression unit 100 that has completed the pre-assembly process is assembled into the container body 21 using the assembly apparatus 200. To do so, first, the container body 21 is held on each container holding arm 420 of the container holding means 400 (container body attaching step).

  At the same time, as shown in FIG. 6, the compression unit 100 is placed on the placement table 320 of the compression unit fixing base 300 in the reverse manner. The compression unit 100 is accurately placed horizontally by two horizontal reference planes, that is, the horizontal reference plane 43 on the fixed scroll 41 side and the horizontal reference plane 321 on the mounting table 320 side, so that the shaft 6 is oriented in the vertical direction (the compression unit). Leveling process).

  Next, each chuck claw 331 is moved toward the compressor center line XX so that the axis of the compression unit 100 (the rotation axis of the shaft main shaft 61) coincides with the compressor center line XX (compression). Unit centering process).

  Next, the container holding means 400 is lowered, and the lowering is temporarily stopped when the lower end 211 of the container body 21 comes into contact with the edge of the main frame 3. Instead, the press-fitting head 520 is lowered, the upper end 212 of the container body 21 is pressed by the pressing surface 540, the container body 21 is further lowered, and the compression unit 300 is press-fitted into the container body 21. This press-fitting is performed until the lower end 211 of the container body 21 comes into contact with the receiving base 341 of the compression unit fixing base 300 (compression unit press-fitting step).

  When the compression unit press-fitting step is completed, the welding torch 610 of the welding means 600 is moved to the side surface of the main frame 3 while the container body 21 is pressed against the receiving base 341 by the press-fitting head 520, and arc spot welding is performed. The container body 21 is integrally welded to the main frame 3 of the compression unit 100 (compression unit welding process). In addition, by forming the concave portion 34 on the outer peripheral surface of the main frame 3, the press-fitting load can be reduced, and deformation during welding can be absorbed.

  When the compression unit welding process is completed, the press-fitting head 520 is raised to the initial position, and then the sub-frame 7 is assembled. Even during the assembly work of the subframe 7, the compression unit 100 side is fixed by the chuck claws 331.

  Referring to FIG. 7, subframe 7 is attached to subframe fixing base 530 of press-fitting head 520 at the initial position. When the subframe 7 is attached, the horizontal reference surface 531 formed on the subframe fixing base 530 and the horizontal reference surface 721 of the subframe 7 are aligned to perform accurate leveling (subframe leveling step). ).

  Next, the chuck claws 561 of the sub-frame fixing means 560 are moved inward to grip the sub-bearing 71 of the sub-frame 7, and the axis thereof is made to coincide with the compression axis center line XX, and then an electromagnetic coil (not shown) The subframe 7 is magnetically attracted and fixed to the subframe fixing base 530 (subframe centering step).

  Thereafter, as shown in FIG. 8, the press-fitting head 520 is lowered, and the subframe 7 is gradually press-fitted from the upper end 212 side of the container body 21, so that the pressing surface 540 of the press-fitting head 520 contacts the upper end 212 of the container body 21. Press contact is stopped at the time of contact (subframe press-fitting process).

  Next, without releasing the pressing force by the press-fitting head 520, each welding torch 610 of the welding means 600 is moved to a position facing the side surface of the subframe 7, and the container body 21 is integrated with the subframe 7 by arc spot welding. Welding (subframe welding process). In order to reduce the press-fitting load and absorb deformation during welding, it is preferable to form a recess 34 on the outer peripheral surface of the subframe 7 as in the main frame 3.

  The subframe 7 is assembled to the container body 21 through the series of steps described above. When the assembly work is completed, the restraints of the chuck claws 331 and 561 and the respective container holding arms 420 are released, and the press-fitting head 520 is raised to the initial position. Then, the compressor is taken out from the compression unit fixing base 300, and the power cord is connected. Perform wiring and piping. Finally, when an operation test is performed and it is determined that there is no problem, the upper lid 22 and the lower lid 23 are integrally welded to both ends of the container body 21 to form a finished body.

  As described above, according to the present invention, the main frame 3 and the sub frame 7 are press-fitted into the container body 21 of the sealed container (sealed shell) 2, and the horizontal reference plane (assembly standard) of the main frame 3 and the sub frame 7 is assembled. Surfaces) 43 and 72 and the open end surfaces (lower end 211, upper end 212) of the container body 21 are pressed and fixed in the same direction to a fixing jig (compression unit fixing base 300, subframe fixing base 530, etc.) and welded. By doing so, the parallelism of the main frame 3 and the sub-frame 7 can be ensured, and the axial centers of the main bearing 31 and the sub-bearing 71 can be accurately aligned. Therefore, it is possible to prevent the contact at each bearing portion due to the misalignment of the main bearing 31 and the sub-bearing 71 and the non-uniformity of the magnetic gap of the electric motor 5 and improve the performance and reliability of the compressor.

  The assembly method of the present invention is a scroll compressor (see FIG. 1) having a shaft with a crankshaft projecting outside the outer diameter of the main shaft, and the shaft must first be inserted into the main frame. The present invention can also be applied to a compressor having a structure in which the main bearing and the stator inner diameter are directly positioned and cannot be welded. Further, since the compressed unit that has been aligned in the sub-process (pre-assembly process) can be incorporated into the container body, it is possible to divide the assembly.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, this invention is not limited to this embodiment. A person skilled in the art having ordinary technical knowledge engaged in the field of the method of assembling the scroll compressor will be able to conceive various modifications or variations that can be conceived within the scope of the technical idea described in the claims. The modified examples are naturally included in the technical scope of the present invention.

Sectional drawing which shows an example of the scroll compressor to which the assembly method of this invention is applied. (A) Main part sectional drawing of the main frame which has a recessed part in a welding location, (b) The top view of the main frame which shows the modification of the said recessed part. (A) The front view which shows an example of the assembly apparatus for enforcing the assembly method of this invention, (b) The side view. The disassembled sectional view which shows the relative positional relationship of the said assembly apparatus and a scroll compressor. (A) The principal part expanded sectional view which shows the fixing means of a compression unit fixed base, (b) The principal part expanded sectional view which shows the modification of the said fixing means. Sectional drawing which shows the compression unit assembly process of a scroll compressor. Sectional drawing which shows the sub-frame assembly process of a scroll compressor. Sectional drawing which shows the sub-frame welding process of a scroll compressor. Sectional drawing which shows the scroll compressor assembled by the conventional assembly method. (A)-(c) Sectional drawing which shows the assembly process of the scroll compressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Scroll compressor 2 Sealed container 21 Container body 3 Main frame 31 Main bearing 34 Recessed part 4 Compression part 41 Fixed scroll 42 Orbiting scroll 43 Horizontal reference plane 5 Electric motor 6 Shaft 61 Main shaft 62 Crankshaft 7 Subframe 71 Sub bearing 72 Horizontal reference plane DESCRIPTION OF SYMBOLS 100 Compression unit 200 Assembling apparatus 210 Base 220 Support frame 300 Compression unit fixing base 331 Chuck claw 320 Mounting base 321 Horizontal reference plane 400 Container holding means 420 Container holding arm 500 Press fitting means 520 Press fitting unit 530 Subframe fixing base 531 Horizontal reference plane 560 Subframe fixing means 561 Chuck claw 600 Welding means 610 Welding torch XX Compressor center line

Claims (9)

A compression part having a compression part having a fixed scroll and a turning scroll in an airtight container, an electric motor for driving the turning scroll via a shaft, and a main bearing for supporting one end side of the main shaft of the shaft. In a scroll compressor assembly method comprising: a main frame that supports the main frame; and a sub frame having a sub-bearing that supports the other end of the main shaft of the shaft.
A compression unit assembly process for forming a compression unit by incorporating the compression section and the shaft into the main frame;
After performing a pre-assembly process including a rotor mounting process for integrally mounting the rotor of the electric motor to the main shaft of the shaft,
A compression unit leveling step of setting the compression unit on a compression unit fixing base in a horizontal state so that the shaft is vertical;
A compression unit centering step for positioning and fixing the compression unit by the compression unit fixing means so that the axis of the shaft is positioned on the center line of the compressor on the compression unit fixing base;
After the container body is supported by the container holding means so as to be coaxial with the axis of the shaft, the opening on one end side of the container body is connected to the compression unit fixing base and the container holding means by the first press-fitting means. A compression unit press-fitting step of press-fitting the compression unit into an opening on one end side of the container body, relatively moving until contacting the compression unit fixing base,
A post-assembly process including a compression unit welding process in which the container body is integrally welded to the compression unit by welding means in a state where the container body is pressed against the compression unit fixing base by the first press-fitting means. A method of assembling a scroll compressor.   The scroll compressor assembling method according to claim 1, wherein, in the compression unit leveling step, a horizontal reference surface is formed on a back side of the fixed scroll. The post-assembly process further includes
A subframe leveling step of setting the subframe in a horizontal state on a subframe fixing base;
A subframe centering step for positioning and fixing the subframe such that the axis of the subframe is positioned on the centerline of the compressor on the subframe fixing base by the subframe fixing means;
The second press-fitting means relatively moves the subframe fixing base and the container holding means until the opening on the other end side of the container body contacts the subframe fixing base, and the other end of the container body A sub-frame press-fitting step of press-fitting the sub-frame into the opening on the side;
3. A sub-frame welding step in which the container body is integrally welded to the sub-frame by welding means in a state where the container body is pressed against the sub-frame fixing base by the second press-fitting means. A method for assembling the scroll compressor according to claim 1.   4. The method of assembling a scroll compressor according to claim 3, wherein the horizontal reference plane is formed on the back side of the subframe in the subframe leveling step.   The compression unit fixing means is disposed at equal intervals on a circumference centered on the center line of the compressor, and is movable along the radial direction of the circle, and is formed on the fixed scroll side. The scroll compressor assembly method according to claim 1, further comprising a plurality of chuck claws that engage with the chuck grooves.   6. The method of assembling a scroll compressor according to claim 5, wherein each of the chuck claws is vertically movable and presses the compression unit toward the compression unit fixing base through the chuck groove when the chuck claw is lowered.   The chuck groove has a tapered surface that converts a horizontal force into a downward force at a portion engaging with the chuck claw, and the chuck claw moves the compression unit through the tapered surface when moving inward in the radial direction. 6. The method of assembling a scroll compressor according to claim 5, wherein the assembly is pressed toward the compression unit fixing base.   The main frame and / or the sub-frame has a concave portion that forms a gap having a predetermined width between the outer peripheral surface and the inner surface of the container body, and the concave portion is selected as a welding portion by the welding means. Item 8. A method for assembling a scroll compressor according to Item 1.   The shaft has a main shaft as an output shaft of the electric motor, and a crankshaft formed eccentrically with respect to the main shaft and connected to the orbiting scroll, and the crankshaft is outside an outer diameter of the main shaft. In the compression unit assembling step, the main shaft of the shaft is inserted into the main bearing of the main frame, the crank shaft is connected to the orbiting scroll, and then the fixed scroll is The method of assembling a scroll compressor according to claim 1 or 2, wherein the scroll compressor is attached to a main frame.

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